/*
 * Copyright (c) 2008 Princeton University
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Authors: Niket Agarwal
 */

#include "mem/ruby/network/garnet-fixed-pipeline/Switch_d.hh"
#include "mem/ruby/network/garnet-fixed-pipeline/Router_d.hh"
#include "mem/ruby/network/garnet-fixed-pipeline/OutputUnit_d.hh"

Switch_d::Switch_d(Router_d *router)
{
        m_router = router;
        m_num_vcs = m_router->get_num_vcs();
        m_crossbar_activity = 0;
}

Switch_d::~Switch_d()
{
        m_switch_buffer.deletePointers();
}

void Switch_d::init()
{
        m_output_unit = m_router->get_outputUnit_ref();

        m_num_inports = m_router->get_num_inports();
        m_switch_buffer.setSize(m_num_inports);
        for(int i = 0; i < m_num_inports; i++)
        {
                m_switch_buffer[i] = new flitBuffer_d();
        }
}

void Switch_d::wakeup()
{
        DEBUG_MSG(NETWORK_COMP, HighPrio, "Switch woke up");
        DEBUG_EXPR(NETWORK_COMP, HighPrio, g_eventQueue_ptr->getTime());

        for(int inport = 0; inport < m_num_inports; inport++)
        {
                if(!m_switch_buffer[inport]->isReady())
                        continue;
                flit_d *t_flit = m_switch_buffer[inport]->peekTopFlit();
                if(t_flit->is_stage(ST_))
                {
                        int outport = t_flit->get_outport();
                        t_flit->advance_stage(LT_);
                        t_flit->set_time(g_eventQueue_ptr->getTime() + 1);
                        m_output_unit[outport]->insert_flit(t_flit); // This will take care of waking up the Network Link
                        m_switch_buffer[inport]->getTopFlit();
                        m_crossbar_activity++;
                }
        }
        check_for_wakeup();
}

void Switch_d::check_for_wakeup()
{
        for(int inport = 0; inport < m_num_inports; inport++)
        {
                if(m_switch_buffer[inport]->isReadyForNext())
                {
                        g_eventQueue_ptr->scheduleEvent(this, 1);
                        break;
                }
        }
}

